Gattis has written for the Who franchise for several scripts, including those for Capaldi.

Gatiss’ Sherlock co-creator and Doctor Who executive producer Steven Moffatt also lauded Capaldi for a job well done. Moffatt is also departing the Doctor Who franchise this year.

Moffatt said in a statement:

“For years before I ever imagined being involved in Doctor Who, or had ever met the man, I wanted to work with Peter Capaldi. I could not have imagined that one day we’d be standing on the TARDIS together.

“Like Peter, I’m facing up to leaving the best job I’ll ever have, but knowing I do so in the company of the best, and kindest and cleverest of men, makes the saddest of endings a little sweeter. But hey, it’s a long way from over. Peter’s amazing, fiery, turbulent Doctor is still fighting the good fight, and his greatest adventures are yet to come. Monsters of the universe, be on your guard—Capaldi’s not done with you yet!”

Reetu Kabra of BBC Worldwide followed up on Gatiss’ tweet by posting a pic of the three of them hard at work.